Kicco's voice just cuts right through you on this one. Shunkan Spline is a 2008 visual novel single with two vocal tracks plus their off-vocal versions, and both songs absolutely deliver. The title track 瞬間スプライン has this driving pop-rock energy with a chorus that climbs and climbs.
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Cherry slows things down into something softer and more wistful, Kicco's vocals sitting perfectly over acoustic guitar and light synths. Four tracks total, so it's over fast. The off-vocal versions are good for appreciating how solid the arrangements actually are underneath.
If you were deep into late-2000s eroge vocal tracks, Kicco was one of those voices you didn't forget.